Drawing Layers 
The layers which are visible by default in 3D view are defined by the 2D view. You can edit them on 3D view as well without however the changes being saved when you return to the 2D view. See Drawing Layers.
The layers which are visible by default in 3D view are defined by the 2D view. You can edit them on 3D view as well without however the changes being saved when you return to the 2D view. See Drawing Layers.